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Intravenous Substance Abuse
Risk-Taking
Needle Sharing
Sexual Behavior
New York City
HIV Infections
Cocaine-Related Disorders
Substance-Related Disorders
Heroin Dependence
Methadone
Crack Cocaine
Narcotics
Patient Dropouts
Logistic Models
Interviews as Topic
Cross-Sectional Studies
Risk Factors
HIV Seropositivity
Substance Abuse Treatment Centers
Syringes
Co-Publications
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